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Chinese Physics C> 2016, Vol. 40> Issue(1) : 017004 DOI: 10.1088/1674-1137/40/1/017004

Drive laser system for the DC-SRF photoinjector at Peking University

  • 1.

     State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, Peking University, Beijing 100871, China

  • Photoinjectors are widely used for linear accelerators as electron sources to generate high-brightness electron beams. The drive laser, which determines the timing structure and quality of the electron beam, is a crucial component of a photoinjector. A new drive laser system has been designed and constructed for the upgraded 3.5-cell DC-SRF photoinjector at Peking University. The drive laser system consists of a 1064 nm laser oscillator, a four-stage amplifier, second and fourth harmonic generators, an optical system to transfer the UV pulses to the photocathode, and a synchronization system. The drive laser system has been successfully applied during stable operation of the DC-SRF photoinjector and its performance meets requirements. A 266 nm laser with an average power close to 1 W can be delivered to illuminate the Cs2Te photocathode and the instability is less than 5% for long time operation. The design considerations for improving the UV laser quality, a detailed description of the laser system, and its performance are presented in this paper.
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  • References

    [1] Ingo Will, Horst I. Templin, Siegfried Schreiber, and Wolfgang Sandner, Optics Express, 19: 23770 (2011)
    [2] S. Zhang, Drive Laser Systems for Electron Accelerators and Free-Electron-Lasers Based on Photocathode-Injector Energy-Recovery-Linac, in Proceedings of ERL09 (Ithaca, New York, 2009), WG110
    [3] K. Zhao, J. K. Hao, Y. L. Hu et al, Nucl. Instrum. Methods A, 475: 564 (2001)
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    [5] X. Y. Lu, L. Lin, K. Zhao, and S. W. Zhang, HEP NP, 28: 8 (2004) (in Chinese)
    [6] E. J. Montgomery, D. W. Feldman, Z. Pan et al, in Proceedings of PAC07, (Albuquerque, New Mexico, 2007), p.1206
    [7] F. Zhu, S.W. Quan, J.K. Hao et al, Status of the DC-SRF Photoinjector for PKU-SETF, in Proceedings of SRF2011 (Chicago, IL, 2011), p.973
    [8] G. D. Boyd, D. A. Kleinman, J. Appl. Phys., 39: 3597 (1968)
    [9] C. Droz, H. Kouta, and Y. Kuwano., Optical Review, 6: 97 (1999)
    [10] J. Friebe, K. Moldenhauer, E. M. Rasel et al, Opt. Comm., 261: 300 (2006)
    [11] T. Onda, M. Shinnosuke, and I. Shoji, A New Walk-Off Compensating BBO Device with Thinner-Plae-Stacked Structrue Fabricated by Room-Temperature Bonding, in Proccedings Nonlinear Optics 2013 (Kohala Coast, Hawaii, 2013), p.NTu3B.1

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Zhi-Wen Wang, Sen-Lin Huang, Lin Lin, Gang Zhao, Sheng-Wen Quan, Ke-Xin Liu and Jia-Er Chen. Drive laser system for the DC-SRF photoinjector at Peking University[J]. Chinese Physics C, 2016, 40(1): 017004. doi: 10.1088/1674-1137/40/1/017004
Zhi-Wen Wang, Sen-Lin Huang, Lin Lin, Gang Zhao, Sheng-Wen Quan, Ke-Xin Liu and Jia-Er Chen. Drive laser system for the DC-SRF photoinjector at Peking University[J]. Chinese Physics C, 2016, 40(1): 017004.  doi: 10.1088/1674-1137/40/1/017004 shu
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Received: 2015-03-02
Revised: 2015-08-06
Fund

    Supported by National Basic Research Project (973) (2011CB808302, 2011CB808304)

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Drive laser system for the DC-SRF photoinjector at Peking University

    Corresponding author: Sen-Lin Huang,
  • 1. State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, Peking University, Beijing 100871, China
  • Received Date: 2015-03-02
  • Accepted Date: 2015-08-06
  • Available Online: 2016-01-20
Fund Project:  Supported by National Basic Research Project (973) (2011CB808302, 2011CB808304)

Abstract: Photoinjectors are widely used for linear accelerators as electron sources to generate high-brightness electron beams. The drive laser, which determines the timing structure and quality of the electron beam, is a crucial component of a photoinjector. A new drive laser system has been designed and constructed for the upgraded 3.5-cell DC-SRF photoinjector at Peking University. The drive laser system consists of a 1064 nm laser oscillator, a four-stage amplifier, second and fourth harmonic generators, an optical system to transfer the UV pulses to the photocathode, and a synchronization system. The drive laser system has been successfully applied during stable operation of the DC-SRF photoinjector and its performance meets requirements. A 266 nm laser with an average power close to 1 W can be delivered to illuminate the Cs2Te photocathode and the instability is less than 5% for long time operation. The design considerations for improving the UV laser quality, a detailed description of the laser system, and its performance are presented in this paper.

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